High resistance to standard-of-care antibiotics observed in the ERADICATE Hp2 study is consistent with the diminishing efficacy of standard-of-care therapies, which has declined to approximately 60%

The Phase 3 study results support potential positioning of TALICIA® as a best-in-class, first-line therapy for treating H. pylori infection, with an estimated 2.5 million patients treated annually in the U.S.

Preparations ongoing for potential NDA submission in H1/2019 and commercial U.S. launch with RedHill’s existing salesforce in H2/2019

Conference call and live webcast to be held today, Monday, Dec. 3, at 8:30 a.m. EST

The ERADICATE Hp2 study successfully met its primary endpoint with a high degree of statistical significance, demonstrating 84% eradication of H. pylori infection with TALICIA® versus 58% in the active comparator arm in the intent-to-treat (ITT) population (p<0.0001). No safety issues were reported in the study and TALICIA® was found to be well tolerated.

Dror Ben-Asher, RedHill’s CEO, stated: “We are delighted with these excellent top-line results and are preparing for U.S. New Drug Application (NDA) submission, expected in the first half of 2019, subject to FDA feedback. Our established U.S. commercial operations team and GI-focused sales force are well-positioned for the potential U.S. commercial launch of TALICIA®, expected in the second half of 2019, subject to FDA approval.”

TALICIA® is a novel and proprietary fixed-dose, all-in-one oral capsule combination of two antibiotics, rifabutin and amoxicillin, and a proton pump inhibitor (PPI), omeprazole. The ERADICATE Hp2 two-arm, randomized, double-blind, active comparator-controlled study investigated 455 dyspepsia patients with confirmed H. pylori infection at 55 clinical sites across the U.S. Subjects were randomized 1:1 to receive four capsules, three times daily, of either TALICIA® or the active comparator, a dual therapy amoxicillin and omeprazole regimen at equivalent doses, for a period of 14 days.

The efficacy of current standard-of-care therapies continues to decline and has been reported in literature to be approximately 60%2 due to high resistance of H. pylori bacteria to the antibiotics commonly used in these therapies, primarily clarithromycin and metronidazole.

Preliminary H. pylori culture results taken throughout the ERADICATE Hp2 study from patients across 20 U.S. states confirmed the high resistance3 of H. pylori to the antibiotics most commonly used for treatment, clarithromycin (17% resistance) and metronidazole (43% resistance). Importantly, no resistance to rifabutin, a key component in TALICIA®’s unique and proprietary formulation, was detected in the study.

Moreover, consistent with the literature describing the diminished efficacy of standard-of-care therapies, preliminary results4 from the open-label part of the ERADICATE Hp2 Phase 3 study showed 64% eradication of H. pylori with these therapies.

“The growing resistance of H. pylori to the antibiotics commonly used in standard-of-care therapies was confirmed in this study, which demonstrated the high resistance of the Helicobacter bacteria to clarithromycin and metronidazole. The resulting high failure rates of standard-of-care treatments, estimated at 30-40%, are a major public concern among the medical community worldwide and underscore the urgent need for new H. pylori eradication therapies, especially those utilizing antibiotics where resistance is rare such as amoxicillin and rifabutin,” statedProfessor David Graham, M.D., M.A.C.G., lead investigator of the ERADICATE Hp2 study.

TALICIA® was granted Qualified Infectious Disease Product (QIDP) designation and Fast-Track development designation by the FDA, including eligibility for six-month priority review and a total of eight years of U.S. market exclusivity. TALICIA® is also covered by U.S. patents which extend patent protection until at least 2034, with additional pending patents and applications in various territories worldwide.

H. pylori bacterial infection affects over 50% of the adult population worldwide5 and 30-40% of the U.S. population6, with an estimated 2.5 million patients treated annually in the U.S.7

H. pylori infection is the strongest risk factor for the development of gastric cancer8 and a major risk factor for development of peptic ulcer disease9.

Ira Kalfus, M.D. RedHill’s medical director, added: “I am thrilled with the study results which support the outstanding efficacy of TALICIA® for treating H. pylori infection. The excellent results from both Phase 3 studies could position TALICIA® to become the new standard-of-care, best-in-class, first-line therapy for eradication of H. pylori. I look forward to further discussion with FDA about advancing this potential new therapy for H. pylori infection towards an NDA submission. I would like to thank all the patients, physicians and clinical staff who were involved in this study, as well as the lead investigator of the study, Professor David Graham and the RedHill team for their commitment to benefiting people infected with H. pylori.”

RedHill will continue to analyze the top-line data from the ERADICATE Hp2 study, including antibiotic susceptibility and resistance, and plans to meet with the FDA to present the data and discuss the path towards potential marketing approval of TALICIA® in the U.S.

The ERADICATE Hp2 study top-line results were provided to RedHill by an independent third-party following an independent analysis and remain subject to completion of the independent review and analysis of the underlying data, including all safety, secondary and other outcome measures, and completion of the Clinical Study Report.

The webcast, including a slide presentation, will be broadcast live and available for replay 30 days on the Company's website, http://ir.redhillbio.com/events.

To participate in the conference call, please dial one of the following numbers 15 minutes prior to the start of the call: United States: +1-800-239-9838; International: +1-929-477-0448; and Israel: +972-3-721-9463. The access code for the call is: 2626201.

About TALICIA® (RHB-105)TALICIA® (RHB-105) is a novel and proprietary fixed-dose, all-in-one oral capsule combination of two antibiotics, rifabutin and amoxicillin and a proton pump inhibitor (PPI), omeprazole. TALICIA® is pursuing an indication of treatment of H. pylori infection, regardless of ulcer status, a significantly broader indication than current standard treatments for H. pylori infection. TALICIA® has been investigated in two positive Phase 3 studies for the treatment of H. pylori: The ERADICATE Hp2 confirmatory Phase 3 study met its primary endpoint, with top-line results demonstrating 84% eradication of H. pylori infection (p<0.0001). The ERADICATE Hp first Phase 3 study met its primary endpoint, demonstrating 89.4% efficacy in eradicating H. pylori infection with TALICIA® (p<0.001). TALICIA® was granted Qualified Infectious Disease Product (QIDP) designation and Fast-Track development designation by the FDA, including eligibility for six-month priority review and a total of eight years of U.S. market exclusivity. TALICIA® is also covered by U.S. patents which extend patent protection until at least 2034, with additional pending patents and applications in various territories worldwide.

About the ERADICATE Hp2 studyThe ERADICATE Hp2 confirmatory Phase 3 study is a two-arm, randomized, double-blind, active comparator-controlled, confirmatory Phase 3 study which compared TALICIA® against a dual therapy amoxicillin and omeprazole regimen at equivalent doses. The study investigated 455 dyspepsia patients with confirmed H. pylori infection at 55 clinical sites across the U.S. Subjects were randomized 1:1 to receive four capsules, three times daily, of either TALICIA® or the active comparator, for a period of 14 days. Subjects were assessed for the study’s primary endpoint of eradication of H. pylori infection at least 43 days after initiation of treatment. The study was 90% powered to detect a 13% treatment effect (active arm 83% vs. control arm 70%). Patients in the study who remained H. pylori-positive after completing treatment in either arm were offered treatment with standard-of-care therapies that included clarithromycin and/or metronidazole-based triple therapy or quadruple therapy, in an open-label setting.

About H. pyloriH. pylori bacterial infection affects over 50% of the adult population worldwide8 and 30-40% of the U.S. population6, with an estimated 2.5 million patients treated annually in the U.S.

H. pylori is classified as a group I carcinogen by the International Agency for Research on Cancer. It is the strongest risk factor for the development of gastric cancer8 and a major risk factor for peptic ulcer disease9, and gastric mucosa-associated lymphoid tissues (MALT) lymphoma10. Eradication of H. pylori is becoming more difficult; Current standard-of-care therapies fail in approximately 30-40% of patients, who remain H. pylori positive, due to increasing resistance of H. pylori to antibiotics commonly used in standard combination therapies3. Clarithromycin-resistant H. pylori was formally categorized by the World Health Organization as a pathogen for which there is a high priority need to develop new treatments11. The 2018 global market for H. pylori eradication therapies is estimated at approximately $4.8 billion, of which $1.4 billion is from the U.S.

The ERADICATE Hp2 confirmatory Phase 3 study with TALICIA® (RHB-105) is registered on www.ClinicalTrials.gov, a web-based service of the U.S. National Institutes of Health (NIH), which provides access to information on publicly and privately supported clinical studies.

This press release contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Such statements may be preceded by the words “intends,” “may,” “will,” “plans,” “expects,” “anticipates,” “projects,” “predicts,” “estimates,” “aims,” “believes,” “hopes,” “potential” or similar words. Forward-looking statements are based on certain assumptions and are subject to various known and unknown risks and uncertainties, many of which are beyond the Company’s control, and cannot be predicted or quantified and consequently, actual results may differ materially from those expressed or implied by such forward-looking statements. Such risks and uncertainties include, without limitation, risks and uncertainties associated with (i) the initiation, timing, progress and results of the Company’s research, manufacturing, preclinical studies, clinical trials, and other therapeutic candidate development efforts; (ii) the Company’s ability to advance its therapeutic candidates into clinical trials or to successfully complete its preclinical studies or clinical trials; (iii) the extent and number of additional studies that the Company may be required to conduct and the Company’s receipt of regulatory approvals for its therapeutic candidates, and the timing of other regulatory filings, approvals and feedback; (iv) the manufacturing, clinical development, commercialization, and market acceptance of the Company’s therapeutic candidates; (v) the Company’s ability to successfully promote Donnatal®, Mytesi® and Esomeprazole Strontium Delayed-Release Capsules 49.3 mgand commercialize EnteraGam®; (vi) the Company’s ability to establish and maintain corporate collaborations; (vii) the Company's ability to acquire products approved for marketing in the U.S. that achieve commercial success and build its own marketing and commercialization capabilities; (viii) the interpretation of the properties and characteristics of the Company’s therapeutic candidates and the results obtained with its therapeutic candidates in research, preclinical studies or clinical trials; (ix) the implementation of the Company’s business model, strategic plans for its business and therapeutic candidates; (x) the scope of protection the Company is able to establish and maintain for intellectual property rights covering its therapeutic candidates and its ability to operate its business without infringing the intellectual property rights of others; (xi) parties from whom the Company licenses its intellectual property defaulting in their obligations to the Company; (xii) estimates of the Company’s expenses, future revenues, capital requirements and needs for additional financing; (xiii) the effect of patients suffering adverse experiences using investigative drugs under the Company's Expanded Access Program; and (xiv) competition from other companies and technologies within the Company’s industry. More detailed information about the Company and the risk factors that may affect the realization of forward-looking statements is set forth in the Company's filings with the Securities and Exchange Commission (SEC), including the Company's Annual Report on Form 20-F filed with the SEC on February 22, 2018. All forward-looking statements included in this press release are made only as of the date of this press release. The Company assumes no obligation to update any written or oral forward-looking statement, whether as a result of new information, future events or otherwise, unless required by law.

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